5 Answers

Too Hot or Lean Pre-Ignition Range. Pre-ignition or Arching. Need new plug wires too and use dielectric grease inside the boots on both ends. Also auto-ignition (i.e. knocking Pinging, too low or too high octane), run hot, low octane gas, high octane gas may have been added to which makes hotter temperature inside the cylinder. Check computer for codes knocking or may have the wrong plugs used, after-market plugs ect. Only use the OEM plugs gapped correctly. Gap may be off. May be out of time ever so slightly too, may mean bad timing set also, or bad sensor or computer.

Common problem with Kia. Detonation most likely with the knock sensor not doing it's job.
Running a higher octane fuel such as premium may help. Also check with Kia to see if an
updated ECU program is available for your vehicle.

Related Questions

I took off my air intake plenum to replace the spark plugs. Now that I'm reassembling everything, I can't find where to plug in an orange connector on the driver's side of the intake? How could What i...

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use. Content will be removed if CarGurus becomes aware that it violates our policies.